To provide an optimum charge providing system, an optimum equipment providing system, and a recording medium which can present the least cost and the best equipment and service.

Customer's equipment or equipment group 15 is provided with a load measuring instrument 3 and load prediction data 23 are calculated by performing a predictive calculation based upon measured load data 17. On the basis of the load data 17, load prediction data 23, and equipment data 19, billed amounts 25 of this period and billed amounts 27 of the next period are calculated by charge systems according to billing system data 21 and presented to the customer.